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How to Add a Signature in Apple Mail

Adding a professional email signature to Apple Mail is a great way to ensure your brand looks consistent in every email you send. But Apple Mail has a few quirks when it comes to HTML signatures, and if you don’t set it up correctly, your images might appear as attachments or your formatting could break.

In this guide, we’ll cover:

How to Add a Signature in Apple Mail on Mac

If you’ve created your signature in an HTML generator or a document, here are the steps to add it to the Mail app on macOS:

  1. Open the Mail app on your Mac.
  2. In the top menu bar, click Mail > Settings (or Preferences on older macOS versions).
  3. Click on the Signatures tab at the top of the window.
  4. In the left column, select the email account you want to use this signature for.
  5. Click the + (plus) button in the middle column to create a new signature.
  6. Give your signature a name (e.g., “Work Signature”).
  7. Uncheck the box that says “Always match my default message font”. This is crucial — if you leave it checked, Apple Mail will strip out your custom fonts and formatting!
  8. Copy your signature from your generator or document, and paste it into the right-hand column.
    • Note: The preview in the settings window might look slightly wrong or images might appear as empty boxes. This is normal in Apple Mail. It will look correct when you compose a new email.
  9. Close the Settings window and open a new email to test it.

How to Add a Signature on iPhone and iPad

Adding a signature on iOS is slightly different because you do it through the Settings app, not the Mail app itself.

  1. Open the Settings app on your iPhone or iPad.
  2. Scroll down and tap on Mail (or Apps > Mail in iOS 18).
  3. Scroll to the bottom and tap on Signature.
  4. Choose whether you want the signature to apply to All Accounts or Per Account.
  5. Delete the default “Sent from my iPhone” text.
  6. Paste your copied signature into the text box.
  7. Important: If the formatting looks wrong after pasting, shake your iPhone to trigger the “Undo” popup, and tap Undo Change Attributes. This removes Apple’s default formatting and restores your original design.

Common Apple Mail Signature Issues

Apple Mail is known for a few specific issues when handling HTML signatures:

  • Images showing as attachments: This happens if your images are embedded directly rather than hosted online. Always use a signature generator that hosts your images on a secure server.
  • Formatting disappearing: Always uncheck “Always match my default message font” on Mac, and use the “Undo Change Attributes” trick on iPhone.
  • Dark Mode issues: Apple Mail automatically inverts colours in Dark Mode. To prevent your logo from disappearing, use a PNG with a transparent background or add a subtle white glow around dark text in your logo.

The Easier Way: Create and Install with Signature Hound

If you want to skip the hassle of broken formatting and image attachment issues, Signature Hound makes it incredibly easy.

  • Our templates are rigorously tested to work perfectly in Apple Mail on both Mac and iOS.
  • We host all your images on our fast, secure CDN so they never appear as attachments.
  • You can easily share the signature with your whole team so everyone looks consistent.

Get started today.

From individuals to big business, we’ve made it easy to create perfect email signatures.

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